-73-第46卷第1期非金属矿Vol.46No.12023年1月Non-MetallicMinesJanuary,2023沥青碳包覆量对隐晶质石墨电化学性能的影响尹伟飞1,2邱杨率1,2*张凌燕1,2刘淮亮1,2(1武汉理工大学资源与环境工程学院，湖北武汉430070；2矿物资源加工与环境湖北省重点实验室，湖北武汉430070)摘要以吉林某地高纯球形化隐晶质石墨为原料，利用石油沥青对其进行包覆-炭化改性处理，制备锂离子电池负极材料，考察了沥青碳包覆量对隐晶质石墨负极材料结构及电化学性能的影响。结果表明，沥青碳包覆层改善了隐晶质石墨的表面形貌，改性后的隐晶质石墨具有更好的循环充放电性能和倍率充放电性能。当包覆量为14%时，经30次循环充放电后试样的放电容量保持率较未改性试样提高8.88%。当包覆量为18%时，在1C电流密度下，试样放电容量保持率较未改性试样提高69.12%。关键词隐晶质石墨；沥青；碳包覆；负极材料；电化学性能中图分类号：TM912.9文献标志码：A文章编号：1000-8098(2023)01-0073-05EffectofAsphaltCarbonCoatingAmountonElectrochemicalPropertiesofCryptocrystallineGraphiteYinWeifei1,2QiuYangshuai1,2*ZhangLingyan1,2LiuHuailiang1,2(1SchoolofResourcesandEnvironmentalEngineering,WuhanUniversityofTechnology,Wuhan,Hubei430070;2HubeiKeyLaboratoryofMineralResourcesProcessingandEnvironment,Wuhan,Hubei430070)AbstractTheanodematerialsforlithiumionbatterieswerepreparedbycoatingandcarbonizationofhighpurityspheroidalcryptocrystallinegraphitefromaplaceinJilinprovince.Theeffectsofasphaltcarboncoatingamountonthestructureandelectrochemicalpropertiesofcryptocrystallinegraphiteanodematerialsweresystematicallyinvestigated.Theresultsshowthatasphaltcarboncoatingcanimprovethesurfacemorphologyofcryptocrystallinegraphite,andthemodifiedcryptocrystallinegraphitehasbettercyclicchargeanddischargeperformanceandratechargeanddischargeperformance.Whenthecoatingamountis14%,thedischargecapacityretentionrateofthesampleafter30cyclesofchargeanddischargeis8.88%higherthanthatoftheunmodifiedsample.Whenthecoatingamountis18%,thedischargecapacityretentionrateofthesampleat1Cisincreasedby69.12%comparedwiththatoftheunmodifiedsample.Keywordscryptocrystallinegraphite;asphalt;carboncoating;negativeelectrodemate...
